peephole
nounUK /ˈpiːphəʊl/ · US /ˈpiːphoʊl/
Etymology From peep + hole.
1
A small hole, opening, or piece of glass, especially in a door, through which one can look without being seen.
- It’s a conjurer’s den. — I shouldn’t be surprised if cabby’s old gent is staring at us all the while from some peephole of his own.1897, Richard Marsh, The Beetle:
- Derived terms
- peepholed, peephole optimization, peepholer, peepholing